#TextView 高亮实现

基本使用方法：

textView.setAutoLinkMask(Linkify.ALL);
//public static final int WEB_URLS = 1;
//public static final int EMAIL_ADDRESSES = 2;
//public static final int PHONE_NUMBERS = 4;
//public static final int MAP_ADDRESSES = 8; 
//public static final int ALL = 15;
textView.setMovementMethod(LinkMovementMethod.getInstacne());

setMovementMethod()是设置相应点击跳转时间触发用的。

去研究了一下TextView的源码。URL地址匹配实际上是用的正则做的。
所以我们也能很简单的实现这个东西。

#修改源码，实现自己的高亮和自定义跳转

首先拿到我们要显示的字符串，创建Spannable对象：

private Spannable.Factory mSpannableFactory = Spannable.Factory.getInstance();
Spannable spannable = mSpannableFactory.newSpannable(pili.description);

然后我们要去拿到的spannable进行处理，将我们要高亮的数据正则匹配出来。

1. 先移除掉spannable中已经存在的URLSpan

  URLSpan[] old = text.getSpans(0, text.length(), URLSpan.class);
  for (int i = old.length - 1; i >= 0; i--) {
    text.removeSpan(old[i]);
  }

2. 匹配URL地址，并设置Spannable

public static final Linkify.MatchFilter sUrlMatchFilter = new Linkify.MatchFilter() {
         public final boolean acceptMatch(CharSequence s, int start, int end) {
         if (start == 0) {
             return true;
         }

         if (s.charAt(start - 1) == '@') {
             return false;
         }
         return true;
         }
};
private static final String makeUrl(String url, String[] prefixes,
                                      Matcher m, Linkify.TransformFilter filter) {
      if (filter != null) {
          url = filter.transformUrl(m, url);
      }

      boolean hasPrefix = false;

      for (int i = 0; i < prefixes.length; i++) {
          if (url.regionMatches(true, 0, prefixes[i], 0,
                  prefixes[i].length())) {
              hasPrefix = true;

              // Fix capitalization if necessary
              if (!url.regionMatches(false, 0, prefixes[i], 0,
                      prefixes[i].length())) {
                  url = prefixes[i] + url.substring(prefixes[i].length());
              }

              break;
          }
      }

      if (!hasPrefix) {
          url = prefixes[0] + url;
      }
      return url;
  }
  
  private final void gatherLinks(ArrayList<LinkSpec> links,
                                       Spannable s, Pattern pattern, String[] schemes,
                                       Linkify.MatchFilter matchFilter, 
                                       Linkify.TransformFilter transformFilter) {
     Matcher m = pattern.matcher(s); // 正则匹配，使用Patterns.WEB_URL
     while (m.find()) {
         int start = m.start();
         int end = m.end();

         if (matchFilter == null || matchFilter.acceptMatch(s, start, end)) {
             LinkSpec spec = new LinkSpec();
             String url = makeUrl(m.group(0), schemes, m, transformFilter);
             spec.url = url;
             spec.start = start;
             spec.end = end;
             links.add(spec);
         }
     }
   }
   class LinkSpec {
      String url;
      int start;
      int end;
  }

  private final void applyLink(String url, int start, int end, Spannable text) {
      URLSpanNoUnderline span = new URLSpanNoUnderline(url);
      text.setSpan(span, start, end, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
  }
  public class URLSpanNoUnderline extends ClickableSpan {
      private final String mURL;
      public URLSpanNoUnderline(String url) {
          mURL = url;
      }

      public String getURL() {
          return mURL;
      }

      @Override
      public void onClick(View widget) {
          final Context context = widget.getContext();
          BrowserActivity.startActivity(context, mURL);
      }
      @Override
      public void updateDrawState(TextPaint ds) {
          super.updateDrawState(ds);
          ds.setUnderlineText(false);  //取消下划线
          ds.setColor(0xff0066ff);     //指定文字颜色
          //ds.setTextSize(ds.getTextSize()*1.1F);
      }
  }